{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "The synthesis , characterization , and functional in vitro assay in cardiac and smooth muscle ( vascular and nonvascular ) of a series of 4 - imidazo [ 2 , 1 - b ] thiazole - 1 , 4 - dihydropyridines are reported ."}
{"Chemical": ["4 - imidazo [ 2 , 1 - b ] thiazole - 1 , 4 - dihydropyridines"]}